🔒 Add environment-based configuration system

- Add .env.example template with all configurable values
- Create comprehensive .gitignore for personal data
- Add sanitization script to remove hardcoded personal info
- Add environment-aware deployment scripts
- Add ENVIRONMENT.md documentation
- Keep personal information in .env (gitignored)

This makes the repository safe for public sharing while keeping personal domains, emails, and secrets secure.

.env.example

@@ -0,0 +1,35 @@
+# Webhook-based Deployment Configuration
+# Copy this to .env and customize for your environment
+
+# Webhook Security
+WEBHOOK_SECRET=your-webhook-secret-here
+
+# Your Domain Configuration
+BASE_DOMAIN=your-domain.com
+WEBHOOK_DOMAIN=webhook.your-domain.com
+KNATIVE_DOMAIN=your-domain.com
+
+# Application Domains
+DEV_DOMAIN=2048-dev.your-domain.com
+STAGING_DOMAIN=2048-staging.your-domain.com
+PROD_DOMAIN=2048.your-domain.com
+
+# Canonical Knative Domains
+DEV_CANONICAL_DOMAIN=game-2048-dev.game-2048-dev.dev.your-domain.com
+STAGING_CANONICAL_DOMAIN=game-2048-staging.game-2048-staging.staging.your-domain.com
+PROD_CANONICAL_DOMAIN=game-2048-prod.game-2048-prod.your-domain.com
+
+# Paths and Configuration
+MANIFESTS_PATH=/home/administrator/k8s-game-2048/manifests
+KUBECONFIG_PATH=/etc/rancher/k3s/k3s.yaml
+
+# Deployment Options
+DEPLOY_INGRESS=true
+WEBHOOK_REPLICAS=1
+
+# GitHub Repository (for container registry)
+GITHUB_REPOSITORY=your-username/k8s-game-2048
+CONTAINER_REGISTRY=ghcr.io
+
+# Email for SSL certificates
+CERT_EMAIL=your-email@your-domain.com